Key Laboratory of Western Mine Exploitation and Hazard Prevention

Fengcheng, China

Key Laboratory of Western Mine Exploitation and Hazard Prevention

Fengcheng, China

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Deng J.,Xi'an University of Science and Technology | Deng J.,Key Laboratory of Western Mine Exploitation and Hazard Prevention | Xiao Y.,Xi'an University of Science and Technology | Xiao Y.,Key Laboratory of Western Mine Exploitation and Hazard Prevention | And 4 more authors.
Fuel | Year: 2015

To study the spontaneous combustion and anaerobic cooling of coal, a 15-t experimental furnace was constructed, and large-scale spontaneous combustion tests were conducted. The coal sample came from No. 3 seam in Dongtan mine in Yanzhou coalfield, Shandong province, China. The variations in temperature, gas ratios, oxygen consumption rate, and heat intensity were studied. The experimental results show that for coal spontaneous combustion below 70 °C, the temperature increases slowly with time and the oxygen consumption rate and heat intensity increase slowly with temperature and accelerate when the temperature exceeds 100 °C. In anaerobic cooling, the cooling rate decreases with the decrease in temperature. When the coal temperature goes from 452.7 to 250.0 °C, the cooling rate decreases rapidly, whereas below 250.0 °C, the cooling rate decreases slowly. The variation trends of the CO2/CO, CH4/C2H6, C2H4/C2H6, and C3H8/C2H6 gas ratios in the spontaneous combustion and anaerobic cooling of coal in a certain range of temperature can be used to predict the temperature of coal. © 2015 Published by Elsevier Ltd.


Cheng L.-H.,Xi'an University of Science and Technology | Cheng L.-H.,Key Laboratory of Western Mine Exploitation and Hazard Prevention | Li S.-G.,Xi'an University of Science and Technology | Li S.-G.,Key Laboratory of Western Mine Exploitation and Hazard Prevention | And 2 more authors.
Procedia Engineering | Year: 2011

Rationality of assessment index system plays an important role for emergency capability in the coal mine. Combined with the existing results, the primary assessment index system including eight first-level indexes for emergency capability was established based on analysis of influence factor. It was tested with structure equation model (SEM for short) based on some questionnaires and Amos software. And six first-level indexes were determined. The result shows that the assessment index system for emergency capability in the coal mine is objective by structure equation model. © 2011 Published by Elsevier Ltd.


Deng J.,Xi'an University of Science and Technology | Deng J.,Key Laboratory of Western Mine Exploitation and Hazard Prevention | Pu G.-M.,Xi'an University of Science and Technology | Pu G.-M.,Key Laboratory of Western Mine Exploitation and Hazard Prevention | And 4 more authors.
Journal of Coal Science and Engineering | Year: 2012

Using a 20 L spherical explosion suppressing test system, the largest gas explosion pressure and maximum pressure rising rate with additives of ultra-fine ABC dry powder and diatomite powder were tested and compared, and the explosion suppression effect of the two kinds of powder was analyzed. Experimental results show that both powders can suppress gas explosion and ABC dry powder is superior to diatomite powder. Adding two powders under the same experimental conditions, when methane concentration is 7.0%, the maximum explosion pressure decreased 39% and 4%, respectively, while the rising rate of the maximum pressure decreased 80% and 53%, respectively. When methane concentration is 9.5%, the maximum explosion pressure decreased 14% and 12%, respectively, the rising rate of maximum pressure decreased 62% and 27%, respectively, the maximum explosion pressure decreased 23% and 18%, respectively, while the rising rate of the maximum pressure decreased 77% and 70%, respectively. When methane concentration is 12.0%, the explosion suppression effect of ultra-fine ABC dry powder is not affected by the methane concentration, and the explosion suppression effect of diatomite powder under high methane concentrations is more obvious. © The Editorial Office of Journal of Coal Science and Engineering (China) and Springer-Verlag Berlin Heidelberg 2012.


MA L.,Xi'an University of Science and Technology | MA L.,Key Laboratory of Western Mine Exploitation and Hazard Prevention | XIAO Y.,Xi'an University of Science and Technology | XIAO Y.,Key Laboratory of Western Mine Exploitation and Hazard Prevention | And 3 more authors.
Mining Science and Technology | Year: 2010

In order to reduce the number of accidents due to explosions of flammable gases in the goaf of coalmines, the conditions for explosion of flammable gases and their explosion limits, affected to a considerable extent by CO2, are explored. With the use of our experimental equipment suitable for the study of explosion of polybasic explosive gas mixtures, we investigated the effect of CH4/H2=10/1 and CH4/C2H4=10/1 gases mixed with CO2 on their explosion limits. The results indicate that after adding CO2, the explosion limit of the CH4/H2 (or C2H4) =10/1 gas mixtures decreased markedly with increasing amounts of CO2. When the amount of CO2 exceeded 25%, the CH4/C2H4=10/1 flammable gas mixture did not lead to explosions. Similar results were obtained when the amount of CO2 exceeded 23% in the CH4/H2=10/1 flammable gas mixture. We also compared the explosion limits and the explosion suppression effect of N2 or CO2 on the explosion limits of the CH4+CO and CH4+C2H4 dual explosive gas mixtures. Along with the increases in the amounts of CO2 or N2, the area of the explosion limits of gas mixtures decreased. Under the same conditions, the explosion suppression effect of CO2 was greater than that of N2. CO2 has clearly the better suppression effect on the explosion of flammable gases in goafs. © 2010 China University of Mining and Technology.


Chai J.,Xi'an University of Science and Technology | Chai J.,Key Laboratory of Western Mine Exploitation and Hazard Prevention | Qiu B.,Xi'an University of Science and Technology | Qiu B.,West Virginia University | And 3 more authors.
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2012

To explore the rock deformation in coal mine by the monitoring of embedded fiber Bragg grating (FBG) through deep borehole, an experimental physical simulation model was built for simulating the strata compression and subsidence process. Additionally, a prefabricate concrete bar with three embedded FBG sensors was designed to simulate deep borehole, and was placed in the physical model. The deformation of the prefabricate concrete bar during strata compression and subsidence processes was measured by the wavelength changes of FBG sensors, and was compared to the strain changes monitored by a resistance strain gauge located on the prefabricate concrete bar at the same location. The test results show that the FBG monitoring system has the advantages of high sensitive, reliable and stable, etc, and can realize the real-time monitoring of rock deformation. It is proved that the FBG monitoring system is an efficient method for measuring and understanding deformation of deep rock strata through a surface borehole.


Jin Y.-F.,Xi'an University of Science and Technology | Jin Y.-F.,Key Laboratory of Western Mine Exploitation and Hazard Prevention | Guo J.,Xi'an University of Science and Technology | Guo J.,Key Laboratory of Western Mine Exploitation and Hazard Prevention | And 2 more authors.
Advanced Materials Research | Year: 2014

Maglev uses MTS815.02 rock mechanics experimental electro-hydraulic systems and NM-4A nonmetallic ultrasonic testing analyzer for coal fire area overlying rock outcrop samples were heated fracture mechanics properties of experimental studies of rock samples reveal the strength and deformation characteristics with temperature the variation. The results showed that: rock microstructure changes at high temperatures on the mechanical properties have a significant effect, the higher the temperature, the greater the sandstone porosity, fissures, the more velocity is smaller; fire zone in the role of coal outcrops, rocks and mineral composition and structure has changed, the internal expansion of initial damage evolution, a large amount of leakage fissures, heat pressure increases, resulting in the upper part of the coal temperature of natural convection of air through the crack, thereby maintaining the vicinity of the coal to maintain a certain concentration of oxygen. Dynamic evolution of coal seam outcrop fire mechanism provides a theoretical basis. © (2014) Trans Tech Publications, Switzerland.


Jin Y.,Xi'an University of Science and Technology | Jin Y.,Key Laboratory of Western Mine Exploitation and Hazard Prevention | Deng J.,Xi'an University of Science and Technology | Deng J.,Key Laboratory of Western Mine Exploitation and Hazard Prevention | And 4 more authors.
Applied Mechanics and Materials | Year: 2012

With regard to goafs where spontaneous combustion of coal is very likely to occur, wireless monitoring and early warning techniques in temperature field of goaf are raised. Wireless monitoring and early warning system in temperature field of goaf based on wireless sensor network is researched and developed. Comprehensive detection, identification and early warning in temperature field of goaf are realized. Key parameters of node deployment of wireless temperature sensor in goaf are figured out and the layout schemes are optimized. According to monitored temperature information, severity of coal spontaneous combustion in goaf is figured out; therefore, early warning methods at the position of fire source are determined. Results of industrial tests on site show that monitoring data acquisition, communication are of good timeliness and reliability, operation of the entire system is stable and key functions and technical specifications can meet the need of early identification and warning of coal spontaneous combustion. © (2012) Trans Tech Publications, Switzerland.


Chai J.,Xi'an University of Science and Technology | Chai J.,Key Laboratory of Western Mine Exploitation and Hazard Prevention | Liu J.-X.,Xi'an University of Science and Technology | Qiu B.,Xi'an University of Science and Technology | And 8 more authors.
Tunnelling and Underground Space Technology | Year: 2011

Coalfields based in east China, such as Huaibei, Datun, Xuzhou, Yanzhou, Yongxia and Huainan, have suffered paroxysmal shaft lining fracture and repeated deformation after repair in the last three decades. This phenomenon has required the development of fractured shaft lining repairing technology and a method for detecting rock strata settlement. It is proposed in this paper that, with the method of fiber Bragg grating sensor incorporated into GFRP, a sensing network of fiber Bragg grating wavelength division multiplexing (WDM)/spatial division multiplexing (SDM) mixing array composed of 18 fiber gratings is formed, and it is used for monitoring the settlement of uncompacted hydrous strata. It is the first time that the fiber Bragg grating sensing system is embedded into the 180-m deep uncompacted strata, and the field experiments are conducted at No. 3 Jingning Coal Mine. The layout of optical sensors, the fiber Bragg grating detecting system, the drilling of the borehole and the embedding method of fiber Bragg grating sensors are introduced. The monitoring results of fiber Bragg grating sensors are compared with groundwater level monitoring results. Engineering practice shows that the fiber Bragg grating sensors are working normally and they can be used to detect strain safely and stably. © 2010.


Chai J.,Xi'an University of Science and Technology | Chai J.,Key Laboratory of Western Mine Exploitation and Hazard Prevention | Zhao W.-H.,Xi'an University of Science and Technology | Zhao W.-H.,Ningxia Coal Mining Company Ltd | And 4 more authors.
Zhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology | Year: 2012

A fiber Bragg grating (FBG) bolt monitoring system was designed and tested to provide long term, continuous monitoring of stresses in the bolt. Stresses that exist in a coal mine tunnel were simulated in the laboratory using a Φ18 metal bolt and a pull out load of 76.44 kN. Three FBG sensors were installed along the bolt to measure strain. An additional sensor was installed at the end of the bolt to monitor the axial stress in the bolt. Three resistance strain gauges were also installed adjacent to the FBG sensors for comparison. The axial stresses and strains were recorded during a pull out test and subsequently analyzed. The results show that axial stresses measured by the FBG sensor at the end of the rod are consistent with both the resistance strain gauges and the other three FBG sensors. The strain transfer function for the FBG sensors along the bolt is 0.879. The FBG sensor is easily installed at the end of the bolt and is reusable. This provides a maintenance advantage. This test method is reliable and effective for real time monitoring of bolts.


Deng J.,Key Laboratory of Western Mine Exploitation and Hazard Prevention | Deng J.,Xi'an University of Science and Technology | Zhao J.,Key Laboratory of Western Mine Exploitation and Hazard Prevention | Zhao J.,Xi'an University of Science and Technology | And 4 more authors.
Procedia Engineering | Year: 2014

It has great importance to study on the characteristic temperatures for prediction and prevention of coal spontaneous combustion. Base on the temperature programmed experiment system and original index gases analysis, establish growth rate analysis to test index gases of CO and C2H4, CO/CO2 and alkane ratio so that to determine the characteristic temperatures of different metamorphism degree of coal, and compare it with index gases analysis. The results show that the extreme values of growth rate analysis are characteristic temperature points for coal spontaneous combustion, and different metamorphic coal has different extreme value. What's more the growth rate analysis is more concise, effective to determine the points and reduce the uncertainty. © 2014 Published by Elsevier Ltd.

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